时钟极性CPOL：即SPI空闲时，时钟信号SCLK的电平（1是空闲时高电平，0是空闲时低电平）。 时钟相位CPHA：即SPI在SCLK第几个边沿开始采样（0是第一个边沿开始，1是第二个边沿开始） 6.transfer () 该功能用于传输1B的数据，参数为发送的数据，返回值为接收到的数据。

In fact, transaction support in the Arduino library is something [Paul] worked on himself, and gets around the problem of having SPI-related code happening in both the main loop of a program and ...

2) Display information to LCDs controlled by your Arduino. 3) Be programmed to act as an extensive combination lock 4) Offer commands, such as ENTER, LOAD, CLEAR, etc.

A new fully featured Arduino development board has been created called the Prestissimo Uno+ which is now available to back via Kickstarter with earlybird pledges available from just $20, AUS$28 or ...